A Unique Ornament Display in Female Northern Cardinals
نویسندگان
چکیده
منابع مشابه
Female Sterilization in Northern Nigeria
Dear Editor, Female sterilization is the most widely used method of family planning.1,2 However, the reluctance to accept family limitation as normal and the deep seated aversion to surgery has affected its practice on a large scale in Nigeria.3 Ignorance and superstition based on religious and ancient principles are contributory.4We undertook a descriptive analysis of 102 female participants w...
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Yearly, testosterone (T) levels fluctuate as many vertebrates cycle through reproductive and non-reproductive periods. Among many temperate birds, it is well established that levels of T peak as gonads recrudesce for breeding and then fall as gonads regress prior to the non-breeding season. While the tissues producing breeding season T are well studied, the tissues responsible for non-breeding ...
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-We temporarily removed the mates of four female Northern Cardinals (Cardinalis cardinalis) during the pre-nesting period in an attempt to clarify the functions of singing by females. Mate removal had no significant effect on singing rates, number of movements per hour, or distance moved per hour. The failure to increase singing rates after mate removal suggests that singing by female cardinals...
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—Biologists know relatively little of how one of the most important avian phenotypic signals, feather coloration, may be affected by anthropogenic changes resulting from urbanization. We examined the relationship between urbanization and carotenoid-based plumage color of Northern Cardinals (Cardinalis cardinalis) in 13 riparian forests distributed across a rural-to-urban landscape gradient in c...
متن کاملA female melanin ornament signals offspring fluctuating asymmetry in the barn owl.
Sexual selection theory predicts that males advertise quality by displaying extravagant ornaments. By contrast, whether phenotypic variation in females has a signalling function remains an open question. Here, to our knowledge, we provide the first evidence that a female plumage trait can signal fluctuating asymmetry in the offspring. We experimentally demonstrate in wild barn owls (Tyto alba) ...
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ژورنال
عنوان ژورنال: The Wilson Bulletin
سال: 2003
ISSN: 0043-5643
DOI: 10.1676/03-034